Presentation Information
[15p-PA4-1]High-Q hybrid SiC-LN photonic nanocavities for electro-optic tuning
〇Heungjoon Kim1, Bong-Shik Song2, Takashi Asano3 (1.ETRI, 2.Sungkyunkwan Univ., 3.Kyoto Univ.)
Keywords:
Photonic nanocavities,Hybrid SiC-LN platforms,Electro-optic tuning
Silicon-carbide (SiC) photonic nanocavities are promising for quantum photonics because their high Q factors and small mode volumes can enhance zero-phonon line (ZPL) emission of color centers. This enhancement demands precise spectral alignment between the cavity resonance and the ZPL, necessitating an efficient tuning mechanism. Among various approaches, electro-optic tuning is attractive due to its on-chip integrability and compatibility with cryogenic environments. However, the tuning efficiency of the nanocavity is limited by the small electro-optic coefficients of SiC. In this work, we propose a high-Q hybrid SiC–lithium niobate (LN) photonic crystal nanocavity that combines strong optical confinement in SiC with the large electro-optic response of LN. The designed structure supports a resonant mode with a high Q factor exceeding 105 and a small mode volume of 2.4 (λ/n)3. By optimizing the electrode spacing, a tuning efficiency, defined as the ratio of the wavelength shift to the applied voltage, reaches 3.6 pm/V while maintaining a high Q factor, corresponding to an enhancement of approximately 20 times compared to SiC-only nanocavities. This tunability is useful for linewidth-scale resonance control in quantum photonic applications.